When you are talking to someone online and they will not let you log off peacefully. When you log on the next day there are usually 20-30 messages from them asking if you are there in your offline message.

You: Well its kinda late... I'm gonna go get some sleep.
Them: NOOOOOOOOOOO!!!! :'(
Them: Just stay and talk for a few more minutes PLZPLZPLZ
You: Ok...

(30 minutes later)

You: I really have to go, I have to wake up for work in 4 hours.
Them: But I really want to talk to you...
You: I have to go.
Them: 5 more mins!!!!
You: No, sorry. We can talk tomorrow or something.
Them: Tomorrow??? Come on just a few more minutes.
You: Bye
Them: Waaaaiiitt!

(Next Day)

"You have logged on to internet messaging service"

Offline messages:

Them: You there?
Them: Hello?
Them: Did you log off?
Them: I know you are there.
Them: You just went invisible.
Them: Why aren't you talking?
Them: Hellooooooo!?!?!?
*BUZZ!*
Them: Hey talk to me...

"Dude, this chick held me internet hostage for almost an hour last night. I thought I wasn't ever going to be able to log off."